This paper reports that cyclopropylphenylsilylene (1) is obtained by photolysis of 2-cyclopropyl-2-phenylhexamethyl-trisilane. 1 added stereospecifically to cis-and trans2-butene gives the corresponding siliranes. Ope...This paper reports that cyclopropylphenylsilylene (1) is obtained by photolysis of 2-cyclopropyl-2-phenylhexamethyl-trisilane. 1 added stereospecifically to cis-and trans2-butene gives the corresponding siliranes. Opening of the sillranes by methol also occurs in stereospecifically cis fashion.展开更多
The effects of the chiral substituents attached to silicon on the stereoselectivity of the reactions of C-centered chiral silicon compounds wm examined. The investigation was focused on the asymmetric C—C bond format...The effects of the chiral substituents attached to silicon on the stereoselectivity of the reactions of C-centered chiral silicon compounds wm examined. The investigation was focused on the asymmetric C—C bond formation reaction of chiral allylsilanes and α-silylallyl anions with aldehydes. The functionalities of the substituents on silicon can be manipulated to improve the stereoselectivities of the reactions remote from silicon atom.展开更多
Zeolite ZSM-5 has been synthesized with the organosilicon compound γ-aminopropyl triethoxylsilane as structure-directing agent using the composition 10SiO2: Al2O3: 3-5Na2O: 0. 1-0.5R: 40-100H2O(molar ratios). First o...Zeolite ZSM-5 has been synthesized with the organosilicon compound γ-aminopropyl triethoxylsilane as structure-directing agent using the composition 10SiO2: Al2O3: 3-5Na2O: 0. 1-0.5R: 40-100H2O(molar ratios). First of all, γ-aminopropyl triethoxylsilane was quaternarized with bromoethane and ethyl alcohol. XRD, TG, DTA and SEM were used to characterize the sample. The investigation proves that the organosilicon compound resides intact at the channel intersections, and that the silicon atom In this species is located in a framework position. Prehydrolysis of the organosilane precursor is necessary for zeolite formation.展开更多
By the reactlon of (substituted silyl )methanethiols with 1-chloromethyl-2, 8, 9-tri-oxa- 5-aza-1-silabicyclo [3. 3, 3] undecane, eleven novel organosilicon compounds were syn-thesized. Their structures were confirmed...By the reactlon of (substituted silyl )methanethiols with 1-chloromethyl-2, 8, 9-tri-oxa- 5-aza-1-silabicyclo [3. 3, 3] undecane, eleven novel organosilicon compounds were syn-thesized. Their structures were confirmed by 1H NMR, MS and elementary analysis. A rare rearrangement breakdown pattern was found ln their mass spectra. Preliminary bioassay re-sults showed these compounds have some antitumor activity.展开更多
基金Project supported by the National Natural Science Foundation of China.
文摘This paper reports that cyclopropylphenylsilylene (1) is obtained by photolysis of 2-cyclopropyl-2-phenylhexamethyl-trisilane. 1 added stereospecifically to cis-and trans2-butene gives the corresponding siliranes. Opening of the sillranes by methol also occurs in stereospecifically cis fashion.
文摘The effects of the chiral substituents attached to silicon on the stereoselectivity of the reactions of C-centered chiral silicon compounds wm examined. The investigation was focused on the asymmetric C—C bond formation reaction of chiral allylsilanes and α-silylallyl anions with aldehydes. The functionalities of the substituents on silicon can be manipulated to improve the stereoselectivities of the reactions remote from silicon atom.
文摘Zeolite ZSM-5 has been synthesized with the organosilicon compound γ-aminopropyl triethoxylsilane as structure-directing agent using the composition 10SiO2: Al2O3: 3-5Na2O: 0. 1-0.5R: 40-100H2O(molar ratios). First of all, γ-aminopropyl triethoxylsilane was quaternarized with bromoethane and ethyl alcohol. XRD, TG, DTA and SEM were used to characterize the sample. The investigation proves that the organosilicon compound resides intact at the channel intersections, and that the silicon atom In this species is located in a framework position. Prehydrolysis of the organosilane precursor is necessary for zeolite formation.
文摘By the reactlon of (substituted silyl )methanethiols with 1-chloromethyl-2, 8, 9-tri-oxa- 5-aza-1-silabicyclo [3. 3, 3] undecane, eleven novel organosilicon compounds were syn-thesized. Their structures were confirmed by 1H NMR, MS and elementary analysis. A rare rearrangement breakdown pattern was found ln their mass spectra. Preliminary bioassay re-sults showed these compounds have some antitumor activity.
